
.content{ margin-bottom: 60px;}
.topnav{width:100%; height: 53px;top: 41px;overflow: hidden;position: fixed;z-index: 999;  }
.topul li{ width: 100%;}
.topul{position: absolute;width: 100%; left:0; top:0;}
.topul li a{   width:25%;  display:block; float: left; background: white; height: 50px;line-height:50px;  font-size:16px;    text-align: center; }

.topul li:nth-child(1){position: absolute; left: 0; list-style: none; }

.topul li:nth-child(2){position: absolute; left: 25%; }
.topul li:nth-child(3){position: absolute; left: 50%; }
.topul li:nth-child(4){position: absolute; left: 75%; }

.fontb{ color: #FB7217;}

.group_list{ margin-top: 55px;}
.biaoji{ font-size: 12px; margin-top: -20px; color: gray}